Gait & Posture
Volume 23, Issue 2 , Pages 189-199, February 2006

Inverse dynamics calculations during gait with restricted ground reaction force information from pressure insoles

  • A. Forner-Cordero

      Affiliations

    • Institute for Biomedical Technology, Universiteit Twente, Twente, The Netherlands
    • Motor Control Laboratory, Department of Kinesiology, Group Biomedical Sciences, K.U. Leuven, Tervuursevest 101, B-3001 Leuven, Belgium
    • Corresponding Author InformationCorresponding author. Tel.: +32 16 329066; fax: +32 16 329197.
    • ,
  • H.J.F.M. Koopman

      Affiliations

    • Institute for Biomedical Technology, Universiteit Twente, Twente, The Netherlands
    • ,
  • F.C.T. van der Helm

      Affiliations

    • Institute for Biomedical Technology, Universiteit Twente, Twente, The Netherlands

Received 7 May 2004; received in revised form 27 September 2004; accepted 12 February 2005. published online 18 March 2005.

Abstract 

The number of consecutive strides that can be recorded in measurements of gait have been limited due to the number of force plates and dimensions of the measurement field. In addition, the feet are constrained to land on the force plates. A method to calculate the inverse dynamics from the motion and incomplete information from the ground reaction forces (GRF), vertical component and its application point, is presented and compared to the calculations based on force plate measurements. This method is based on the estimation of the three-dimensional GRF during walking with pressure insoles. RMS errors were lower than 20W for knee joint power compared to those derived from force plate measurements. The errors were larger during double stance phase due to errors in the application point measured with the insoles. This method, with some technical improvement, could be implemented in new gait analysis protocols measuring several consecutive steps either on a treadmill or over ground, depending on the motion–measurement system, without constraining foot placement.

Keywords: Inverse dynamics, Pressure insoles, 3D gait analysis, Human gait

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PII: S0966-6362(05)00026-3

doi:10.1016/j.gaitpost.2005.02.002

Gait & Posture
Volume 23, Issue 2 , Pages 189-199, February 2006

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